Top stitching the welt pocket

Instruction 9 for sewing the welt pockets suggests to stitch in the ditch around the welt pocket and the diagram seems to show top stitching on all four sides of the welt. When I got to this step I only sewed the short sides and the top as I suspected that if I top stitched along the bottom of the welt that I would sew the pocket shut and that would be very frustrating. What have other people done at this point?